Simon obermayer



UNITED STATES,

PATENT OFFICE.

SIMON OBERMAYEB, OF CINCINNATI, OHIO.

COMPOUND FOR MO LDERS FACINGS.

.QEPECIE'ICAI'ION forming part of Letters Patent No. 317,843, dated May12, 1885.

Application filed July 26, 1884.

To all whom it may concern: Be it known that I, SIMON OBERMAYER, a

citizen of the United States, residing at Oincinnati, county ofHamilton, State of Ohio, have invented certain new and usefulImprovements in Compounds for Molders Facings, of whichthe followingis aspecification.

The object of my invention is a compound for facing molds for steel andiron castings, that will prevent the molten metal from cutting into themold, and insure smooth sharp castings which are easily cleaned.

My compound consists of ground asbestus, East India or Ceylon plumbagoor graphite, and carbon. The proportions usually employed, and whichgive the best general results, are about one part, by weight, of groundasbestus, one part graphite, and five parts of carbon. By carbon I meanalso charcoal, anthracite coal, coke, 8m. The parts are ground fine andmixed in the usual way other facing compounds are mixed. The compound isdusted on the mold for green-sand molds, and is used as a wash for drysand and loam molds.

The proportions above given are for iron castings of light or mediumweight. When the castings are heavy, I use less carbon and asbcstus andmore plumbago. The proportions are also varied according to the natureof the sand andiron. If the sand is wet or very open, I add more carbonand less plumbago, and if the metal is soft fluid iron I use lessasbestus. If, however, the iron is rough or tough, I use more asbestusand plumbago in proportion to the carbon.

(No specimens.)

For steel castings the proportion of plumbago is less. To produce thebest results for steel, and, in fact, for all castings, the parts mixedin equal proportions will give the best results, but for ordinary workthe cost would be too great. The proportions heretofore given will givegood results, and will also be comparatively inexpensive.

As molder-s sand varies in different localities,and as the metals alsovary in quality and property, no exact proportions can be given for theingredients of any facing compound that will give the best results inevery case; but any skilled molder will be enabled from the foregoingdescription to use my invention to the best advantage with the materialshe has at hand and the character of the work he is required to produce.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

l. A molders facing compound consisting of asbestus plumbago, andcarbon, substantially as hereinbefore set forth.

2. A molders facing compound consisting of asbestus, plumbago, andcarbon, in about the following proportions, to wit: asbestus, one part;plumbago, one part; and carbon, five parts, as hereinbefore set forth.

SIMON OBERMAYER.

Witnesses:

GEO. J. MURRAY, BART KANE.

